Reciprocating pump



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Patented Aug. l, 1944 UNITED STATES PATENT QFFICE .nrzcrPRocATlNG PUMPDamiano Arras, Chester, Conn. Application February 1, 1944, serial No.520,599

(ci. a-4) 5 Claims.

The present invention relates to improvements in pumps, and moreparticularly to improvements in reciprocating pumps suitable for pumpinga variety of fluids, either liquid or gaseous. The present applicationconstitutes a continuation-in-part of my now abandoned but co-pendingapplication Ser. No. 493,271, filed July 2, 1943.

One of the objects of the present invention is to provide a superiorreciprocating pump having simple, reliable and effective means forguarding against the intermixture of the uid being pumped and thelubricating medium.

Another object of the present invention is to provide a reciprocatingpump with a vsuperior construction and arrangement of parts whereby theadequate lubrication of the pistons is assured under all operatingconditions.

Another object of theV present invention is to provide a superiorreciprocating pump designed and adapted to simultaneously pump aplurality of different uids without appreciably intermixing the same.

Stm another object of the present invention is to provide a superiordouble-acting reciprocating pump wherein the lubricating medium may beutilized as a seal to guard against the escape of the fluid being pumpedpast the relatively-reciprocating surfaces.

With the above and other objects in view, as will appear to thoseskilled in the art from the present disclosure, this invention includesall features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out thepresent invention are shown for illustrative purposes:

Fig. 1 is a view in side elevation of one form of double-actingreciprocating pump constructed in accordance with-the present invention;

Fig. 2 is a horizontal sectional view taken onthe line 2 2 of Fig. l;

Fig. 3 is a perspective view of one of the headmembers; d

Fig. 4 is a transverse sectional view taken on the line 4-4 of Fig. 1;

Fig. 5 is a perspective view of the double-ended reciprocatingplunger-unit; and 1 Fig. 6 is a view in vertical central-longitudinalsection of a modified form of reciprocating pump embodying the presentinvention.

The structure of Figs. 1 to 5 inclusive The particular double-actingreciprocating pump illustrated in the figures now under discussion,includes in the main, an outer pump-unit or casing-unit generallydesignated by the reference character I5 and a double-endedreciprocating inner pump-unit or plunger-unit, generally designated bythe reference character I6.

The casing-unit I5 above referred to, includes to the outer end of theintegral neck I8 is a head-member 20, while similarly secured to theouter end of theremovable neck-memberu I9 is a corresponding head-member2I.

The head-members 20 and 2| above referred to are arranged in axialalignment though in opposition, and each thereof is provided at itsouter end with a flange 22. The flange 22 of the headmember 20 is seatedagainst the adjacent outer face of the-integral neck I8 while thesimilar flange of the head-member 2| is seated against the adjacentouter face of the removable neckmember I9. Inwardly of its flange 22,each of the said head-members 20 and 2l is formed with an integralcollar 23 and with an integral vcupshaped piston 24 which latter, forpurposes of convenience of description, may be referred to asY an innerpiston. The integral collar 23 of a given head-member 20 or 2| serves toconcentrically space its integral inner piston 24 from the interiorsurfaces of the neck I8 of the main casing-member I1 or of theneck-member I9, as the case may be. The spacing just referred to servesto provide two ring-like outer piston-chambers 25-25 respectivelysurrounding thel inner pistons 24-24, as is especially Well shown inFig. 2.

The two ring-like outer piston-chambers 25-25 respectively located atthe opposite ends of the pump-structure are, in the instance shown,interconnected by means of piping 26-26. Into an intermediate portion ofthe said piping is connected a reservoir or container 21. Interposedbetween the interior of the container 2'I and the piping 26 is aspring-pressed check-valve 28 serving to permit the down-flow of uidfrom the said container but preventing the movement of fluid in thereverse direction.

'Ihe inner pistons 24- 24 respectively extend with a sliding t, into oneof two piston-chambers 29--29 which may be aptly referred to as innerpiston-chambers. The said pistonchambers 29-29 are respectively formedin the opposite ends of the plunger-unit I6 before referred to; Each ofthe said inner piston-chambers is formed within one of two ring-likepistons 30--30 which, for convenience of description, may be aptlyreferred to as outer pistons. The said outer pistons 30-30 project inopposite direction respectively from the plunger-unit I6 and have theirexteriors and interiors proportioned to slidingly t the adjacent one ofthe outer ring-like piston-chambers 25-25, as is especially well shownin Fig. 2.

Threaded into the end-wall at the inner end of a given one of the innerpistons 24 is the above referred to.

Each of the corresponding valve-housings 22--32 above referred to, hasan inlet-pipe 3l connected to one of its ends and an outlet-pipe 34connected to its opposite end. Mounted within the given valve-housing 32adjacent the inlet-pipe 33 thereof, is an inwardly-openingspring-pressed inlet check-valve 35 constructed and arranged to admitfluid into the interior of the valve-housing 32 for movement into theinner piston-chamber 29, but serving to prevent the flow of fluid in thereverse direction. Also mounted in the interior of a given valve-housing32 adjacent the outletpipe 34 thereof, is an outwardly-openingspringpressed outlet check-valve 36 constructed and airanged to permitthe egress of fluid from the interior of the said valve-housing, butserving to prevent the re-entry of such fluid thereinto.

like outer pistons 30-30 are each provided in their outer peripherieswith two (more or less) duplex piston-rings 31-31. Similarly, the innerends of the respective inner pistons 24-24 are each provided with two(more or less) duplex piston-rings "-38.

The ring-like outer pistons 30-30 respectively located at the oppositeends of the plunger-unit I6 are integrally connected by arelatively-slender tie-bar 39 resulting in the formation of an annulargroove 40 in the central portion of the said plunger-unit. Closelyfitting between the respective opposite side-walls of the groove 40 justreferred to, is a ball-bearing driving-eccentric 4I mounted upon aneccentric pin or stud 42. 'Ihe said eccentric pin 42 extends inwardlyfrom a disk-like drive-head 43 formed upon the inner end of adrive-shaft 44 extending radially outwardly into a position accessiblefor the connection of a motor or the like to its outer end.

The drive-shaft 44 above referred to and the parts carried thereby, aremounted for rotation in .a two-part bearing-housing 45 having itsflanged inner end bolted or otherwise secured in a duid-tight manner toone side of the main casingmember I1. as is shown in Figs. 1 and 2.

Interposed betweenv the inner portion of the drive-shaft 44 and theadjacent portions of the bearing-housing 45, is a. ball-bearing unit 46.Rigidly mounted upon the drive-shaft 44, in a position outwardly withrespect to the ball-bearing unit 46, is a bearing-sleeve 41.

Formed in the inner face of the bearing-sleeve 41 is an `annular groove46 complementing a similar annular groove 49 formed in the adjacentportion of the bearing-housing 45. Jointly tting into the grooves 48 and49 just referred to, is a packing-ring 50 formed of leather, felt orother suitable material and serving to guard against the egress oflubricant from within the casingunit I5.

Formed in the outer face of the bearing-sleeve 41 on the drive-shaft 44is an annular outwardlyopening groove i complementing a similar butinwardly-facing groove 52 formed in the adjacent outer wall of thebearing-housing 45. J ointly interfltting into the grooves 5l and 52just referred to is a packing-ring 53 serving to guard against 75 theegress 'of llubricant outwardly through the outer portion of the saidbearing-housing 45.

From the foregoing it will be seen that as the drive-shaft 44 is turned,the plunger-unit i6 will be reciprocated. This reciprocation of theplunger-unit I6 will cause fluid to be alternately drawn into andexpelled from each of the inner piston-chambers 29. As the plunger-unitI6 reciprocates, lubricating oil or the like in one ringlike outerpiston-chamber 25, will be transferred back and forth to the other outerpiston-chamber 25 through the piping 26. Should the oil in the piping 26and the piston-chambers 25-25 become lessened for any reason, the volumewill be made up automatically by oil flowing down from the container 21past the check-valve 29. In this manner, the various piston-surfaceswill be assured of adequate lubrication, and the lubricating oil or thelike will serve as a seal to prevent escape of the fluid being .pumpedfrom the inner pistonchambers 29-29.

Should conditions make it advisable, the interconnecting tubing 26 andassociated parts may be omitted, and a relatively-small amount oflubricant placed in each of the outer ring-like pistonchambers 25-25.Under these latter conditions, the movement of the ring-like outerpiston-chambers Sli- 30 will serve to distribute such lubricant andminimize wear.

If desired, and as will be obvious to those skilled in the art, one ormore of the ring-like outer piston-chambers 25-25 may be utilized forpumping fluid to an extraneous receptacle, independently of the fluidbeing pumped from the inner piston-chambers 29-29.

The structure of Fig. 6

In Fig. 6 is illustrated a single-ended pumpstructure, the main parts ofwhich correspond in substance to the parts of the structure previouslydescribed, and where pertinent the parts shown in Fig. 6 bear likereference characters. As will be noted by reference to Fig. 6, theplunger-unit lia has only one ring-like piston 3l and has aguide-stem 54at its opposite end. The right end of the main casing-member I1 isclosed by an end-plate 55, rather than having a neckmember such as i9attached thereto. The endplate 55 is -formed with an integralbearingsleeve 56 in which the guide-stem 54 of the plunger-unit iGaslides.

The ring-likeouter piston-chamber 25 may be connected in any mannerdesired to provide for the pumping of a fluid independently of the fluidpumped from the inner piston-chamber 29. In the instance shown, theouter piston-chamber 25 is connected by means of a pipe 51 to acontainer 58, so as to provide for the interchange of lubricant betweenthe said container and the said outer piston-chamber 25. As will beobvious to those skilled in the art, should it be desired to utilize theouter piston-chamber 25 for the pressure-pumping of a fluid to anydesired point, a valve-casing such as 32, together with its complementalcheck-valves, may be attached to the pipe 51.

The invention may be carried out in other speciflc ways than thoseherein set forth without departing from the spirit and essentialcharacteristics of the invention, and the present embodiments are,therefore, to he considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are in. tended to be embraced therein.

I claim:

1. A reciprocating pump, including in combination: a first pump-unit anda complemental second pump-unit one of which is movable toward and awayfrom the other to effect the pumping of fluid; the said first pump-unitbeing formed with an inner piston and with a ring-like outerpiston-chamber surrounding the said inner piston; the said secondpump-unit being formed with a ring-like outer piston and with an innerpiston-chamber located within the said ring-like outer piston; the innerpiston or the said rst pump-unit fitting into the inner piston-chamberwithin the outer piston of the said second pump-unit and the ring-likeouter piston of the said second pump-unit fitting into the ring-likeouter piston-chamber of the said first pump-unit; means providing forthe inow and outflow of fluid with respect to the said innerpiston-chamber; a fluid-receptacle; means connecting the saidduid-receptacle with the aforesaid ring-like outer piston-chamber andconstructed and arranged to provide for the transfer in both directionsof lubricant between the said outer pistonchamber and the saidfluid-receptacle as one of the said pump-umts reciprocates with respectto the other; and means for reciprocating one of the said pump-unitswith respect to the other.

2. A reciprocating pump, including in combination: a first pump-unit anda complemental second pump-unit one of which is movable tward and awayfrom the other to eii'ect the pumping of fluid; the said first pump-unitbeing formed with an inner piston and with a ring-like outerpiston-chamber surrounding the said inner piston; the said secondpump-unit being formed with a ring-like outer piston and with an innerpiston-chamber located within the said ring-like outer piston; the innerpiston of the said first pump-unit fitting into the inner piston-chamberWithin the outer piston of the said second pumpunit and the ring-likeouter piston of the said second pump-unit iitting into the ring-likeouter piston-chamber oi.'v the said first pump-unit; means extendinglongitudinally through the inner piston of the said first pump-unit andpro- Y viding for the inflow and outflow of fluid with respect to thesaid inner piston-chamber; a fluidreceptacle; means interconnecting thesaid fluidreceptacle and the said outer piston-chamber and constructedand arranged to provide for thel interchanse of uid in both directionsbetween the said fluid receptacle and the said outervpistonchamber; andmeans for reciprocating the said second pump-unit with respect to thefirst ilrst pump-unit.

3. A reciprocating pump, including in combination: a pump-casing and acomplemental pump-plunger one of which is reciprocabie with respect tothe other; the said pump-casing being provided at each of its respectiveopposite ends with one of two inner pistons each projecting toward theother; the said pump-casing also being formed with two ring-like outerpistonchambers each of which opens toward the other and each of whichvsurrounds one of the aforesaid inner pistons; the said pump-plungerbeing formed at its respective opposite ends with one of two ring-likeouter pistons and 'with one of two inner piston-chambers respectivelylocated within one oi' the said ring-like outer. pistons; the innerpistons oi' the said pump-casing respectively fitting into one of theinner pistonchambers within the outer pistons of the said pump-plungerand the ring-like outer pistons of the said pump-plunger respectivelyiitting into one of the ring-like outer piston-chambers of the saidpump-casing; fluid-conducting means interconnecting one of thepiston-chambers adjacent one end of the structure with a piston-chamberat the other end of the pump-structure to provide for the interchange ofiluid therebetween; and means for causing reciprocatory movement betweenthe said pump-casing and the said pumpcasing and the said pump-plunger.

4. A reciprocating pump, including in combination: a pump-casing and acomplementa] pump-plunger one of which is reciprocable with respect tothe other; the said pump-casing being provided at each of its respectiveopposite ends with one of two inner pistons each projecting toward theother; the said pump-casing also being formed with two ring-like outerpistonchambers each of which opens toward the other and each of whichsurrounds one of the aforesaid inner pistons; the said pump-plungerbeing formed at its respective opposite ends with one of two ring-likeouter pistons and with one of two inner piston-chambers respectivelylocated within one of the said ring-like outer pistons; the innerpistons of the said pump-casing respectively fitting into one of theinner pistonchambers within the outer pistons of the said pump-plungerand the ring-like outer pistons of the said pump-plunger respectivelyfitting into one of the ring-like outer piston-chambers of the saidpump-casing; means providing for the inflow and outflow of fluid withrespect to the two said inner piston-chambers; and Huid-conducting meansinterconnecting the two said outer piston-chambers with each other andproviding for the interchange of lubricant therebetween; and means forcausing reciprocatory movement between the said pump-casing and the saidpump-plunger.

5. -A reciprocating pump, including in combination: a pump-casing and acomplementa] pump-plunger one of which is reciprocabie with respect tothe other; the said pump-casing being provided at each of its respectiveopposite-ends with one of two inner pistons each projecting toward theother; the said pump-casing also being formed with two ring-like outerpistonchambers each of which opens toward the other and each of whichsurrounds one oi' the aforesaid inner pistons; the said pump-plungerbeing formed at its respective opposite ends with one of two ring-likenecting one of the piston-chambers adjacent one end of the structurewith a piston-chamber at the other end of the pump-structure to providefor the interchange of fluid therebetween; and means for reciprocatingthe said pump-plunger in the interior of the said pump-casing.

DAMIANO ARRAS.

outer pistons andwith one of two inner piston-chambers respectivelylocated 1 pistons of the said Dumm'

